package com.monitor.util;

import java.io.FileNotFoundException;  
import java.io.IOException;  
import java.io.InputStream;  
import java.util.ArrayList;  
import java.util.List;  
  
import org.apache.log4j.Logger;  
import org.apache.poi.hssf.usermodel.HSSFWorkbook;  
import org.apache.poi.ss.usermodel.Cell;  
import org.apache.poi.ss.usermodel.Row;  
import org.apache.poi.ss.usermodel.Sheet;  
import org.apache.poi.ss.usermodel.Workbook;  
import org.apache.poi.xssf.usermodel.XSSFWorkbook;  
import org.springframework.web.multipart.MultipartFile; 

public class POIUtil {
	 private static Logger logger  = Logger.getLogger(POIUtil.class);  
	    private final static String xls = "xls";  
	    private final static String xlsx = "xlsx";  
	      
	    /** 
	     * 读入excel文件，解析后返回 
	     * @param file 
	     * @throws IOException  
	     */  
	    public static List<String[]> readExcel(MultipartFile file) throws IOException{  
	        //检查文件  
	        checkFile(file);  
	        //获得Workbook工作薄对象  
	        Workbook workbook = getWorkBook(file);  
	        //创建返回对象，把每行中的值作为一个数组，所有行作为一个集合返回  
	        List<String[]> list = new ArrayList<String[]>();  
	        if(workbook != null){  
	            for(int sheetNum = 0;sheetNum < workbook.getNumberOfSheets();sheetNum++){  
	                //获得当前sheet工作表  
	                Sheet sheet = workbook.getSheetAt(sheetNum);  
	                if(sheet == null){  
	                    continue;  
	                }  
	                //获得当前sheet的开始行  
	                int firstRowNum  = sheet.getFirstRowNum();  
	                //获得当前sheet的结束行  
	                int lastRowNum = sheet.getLastRowNum();  
	                //循环除了第一行的所有行  
	                for(int rowNum = firstRowNum+1;rowNum <= lastRowNum;rowNum++){  
	                    //获得当前行  
	                    Row row = sheet.getRow(rowNum);  
	                    if(row == null){  
	                        continue;  
	                    }  
	                    //获得当前行的开始列  
	                    int firstCellNum = row.getFirstCellNum();  
	                    //获得当前行的列数  
	                    int lastCellNum = row.getPhysicalNumberOfCells();  
	                    String[] cells = new String[row.getPhysicalNumberOfCells()];  
	                    //循环当前行  
	                    for(int cellNum = firstCellNum; cellNum < lastCellNum;cellNum++){  
	                        Cell cell = row.getCell(cellNum);  
	                        cells[cellNum] = getCellValue(cell);  
	                    }  
	                    list.add(cells);  
	                }  
	            }  
	            workbook.close();  
	        }  
	        return list;  
	    }  
	    public static void checkFile(MultipartFile file) throws IOException{  
	        //判断文件是否存在  
	        if(null == file){  
	            logger.error("文件不存在！");  
	            throw new FileNotFoundException("文件不存在！");  
	        }  
	        //获得文件名  
	        String fileName = file.getOriginalFilename();  
	        //判断文件是否是excel文件  
	        if(!fileName.endsWith(xls) && !fileName.endsWith(xlsx)){  
	            logger.error(fileName + "不是excel文件");  
	            throw new IOException(fileName + "不是excel文件");  
	        }  
	    }  
	    public static Workbook getWorkBook(MultipartFile file) {  
	        //获得文件名  
	        String fileName = file.getOriginalFilename();  
	        //创建Workbook工作薄对象，表示整个excel  
	        Workbook workbook = null;  
	        try {  
	            //获取excel文件的io流  
	            InputStream is = file.getInputStream();  
	            //根据文件后缀名不同(xls和xlsx)获得不同的Workbook实现类对象  
	            if(fileName.endsWith(xls)){  
	                //2003  
	                workbook = new HSSFWorkbook(is);  
	            }else if(fileName.endsWith(xlsx)){  
	                //2007  
	                workbook = new XSSFWorkbook(is);  
	            }  
	        } catch (IOException e) {  
	            logger.info(e.getMessage());  
	        }  
	        return workbook;  
	    }  
	    public static String getCellValue(Cell cell){  
	        String cellValue = "";  
	        if(cell == null){  
	            return cellValue;  
	        }  
	        //把数字当成String来读，避免出现1读成1.0的情况  
	        if(cell.getCellType() == Cell.CELL_TYPE_NUMERIC){  
	            cell.setCellType(Cell.CELL_TYPE_STRING);  
	        }  
	        //判断数据的类型  
	        switch (cell.getCellType()){  
	            case Cell.CELL_TYPE_NUMERIC: //数字  
	                cellValue = String.valueOf(cell.getNumericCellValue());  
	                break;  
	            case Cell.CELL_TYPE_STRING: //字符串  
	                cellValue = String.valueOf(cell.getStringCellValue());  
	                break;  
	            case Cell.CELL_TYPE_BOOLEAN: //Boolean  
	                cellValue = String.valueOf(cell.getBooleanCellValue());  
	                break;  
	            case Cell.CELL_TYPE_FORMULA: //公式  
	                cellValue = String.valueOf(cell.getCellFormula());  
	                break;  
	            case Cell.CELL_TYPE_BLANK: //空值   
	                cellValue = "";  
	                break;  
	            case Cell.CELL_TYPE_ERROR: //故障  
	                cellValue = "非法字符";  
	                break;  
	            default:  
	                cellValue = "未知类型";  
	                break;  
	        }  
	        return cellValue;  
	    }  
}
